Can I use a Cat 6a cable for USB communication? On the cable it says 650 MHz, is this sufficient for USB 2.0? The length of the cable would be about 6 meters (about 19 ft).
If so, would the following be the correct way to wire this?
If the answer to the first question is yes, would it then also be possible to combine it with I2C like below? Is my assumption correct that the pair-shielding will prevent either protocol from interfering with the other? (this way of wiring I2C with twisted pairs I got from NXP's AN255, see figure 30)
I also assume the capacitance from the shielding is not too much for 6 meters of cable for I2C's standard 100 KHz clock? (I don't know how to calculate/measure this)
Background / Extra info
The reason I'm asking this is because I need to pass I2C and USB through a tube of small diameter (inner 16mm), which has several inconvenient bends in it (and it's inside a plaster/concrete wall). This limits the amount (and diameter) of cables I can get through without damaging them.